Interchangeable-tooth segment gear



Patented May 12, 1925.

UNITED STATS FRANZ KARL SCHNEIDER, OF PHILADELPHIA, PENNSYLVANIA.

INTERCHANGEABLE-'IOOTH SEGMENT GEAR.

Application filed November To all whom t may concern.'

Be it known that I, FRANZ KARL SCHNEI- DER, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Interchangeable-Tooth Segment Gears, of which the following is a specification.

@ne object of my invention is to `provide an improved interchangeable inserted tooth segment gear which will be of particular advantage when use-d in lieu, of the driving shell gear on the head motions of looms or in other' capacities where it is required to impart intermittent motion, either rotary or linear.

In transmitting` intermittent motion by means of a toothed segment wheel, it is well known that the end tooth on the lead side is subjected to considerably more wear and strain than any other tooth on the gear; this being due to the impact brought to bear on said end tooth by starting the driven gear or rack into motion. It is obvious therefore that the life of the segment gear is commensurate to the length of time that the lead tooth can resist the continual shock.

I have found that theI life of such a gear may be greatly prolonged by the introduction, in a particular manner, of interchangeable inserted teeth. lVhen the lead tooth of this latter mentioned type of gear begins to show signs of wear, it can be easily removed and interchanged with any other tooth on the wheel.

This process may be repeated as often as the number of teeth on the segment, after which all the teeth may be discarded in favor of an entirely new set.

Vhen my improved segment gear is employed in the head motion of a loom, it replaces the chilled cast iron shell gear which is now in general use. In such capacity my ii'nproved gear has the added advantage of offering a quick and easy method of repairing or replacing a broken or worn tooth without removing the entire gear from the loom. This advantage is recognized as an important factor to anyone skilled in the art of weaving since it avoids the possibility of destroying the timing of loom head motion; it being well known that even a slight movement of the actuating gear out of its original set position will work havoc with the loom and require considerable time to restore the parts to their proper weaving positions.

The above object and other advantageous 7, 1924. Serial N'o. 748,396.

ends which will be set forth hereinafter, I attain in the following manner, reference being had to the accompanying drawing in whichA i Figure 1 is a longitudinal elevation, partly in central vertical section, showing an intermittent segment gear made in accordance with my invention,

Figure 2 is a transverse elevation of the same, partly in section,

Figure 3 is an enlarged fragmentary section taken on'the line 3 8 of Figure 2,

Figure 4 is an enlarged fragmentary section taken on the line 4 4 of Figure 1, and

Figure 5 is an enlarged fragmentary section taken on the line 5 5 of Figure 1.

Referring to the drawing, my invention includes a main shell 6 having an elongated body portion 7 -of arcuate segmental cross section. This body portion has two colla-rs S and 9 at its opposite ends for allowing the device to be secured to the driving shaft; the collar 8 being provided with a set screw 10 for this latter mentioned purpose. Thus theV shaft will pass through the collars and under the body portion 7v with the latter part surounding the shaft at Ypositions between the collars 8 andV 9. i

rThe outer part of the body portion 7 has a series of grooves 11, the'grooves extending' lengthwise and allowing teeth 12`to be freely inserted therein. The body portion 7 is also grooved transversely, at positions spaced apart, to provide arcuate channels 13. These channels extend from the end surface'14 to the end surface 15 of the body portion and provide pockets for arcuate tierods 16. The teeth 12 have holes 17 throughwhich .the tie rods 16 freely pass, as clearly shownv in Figures 3 and 4 of the drawing. Clips 18 and 19 respectively engage the end surfaces 14 and 15 of the body portion 7, said clips having angularly extending flanges Q0 which embrace the inner surface of the body portion 7, as clearly shown in Figures 1 and 2. The clips 18 and 19, at positions registering with the channels 13, have holes through which opposite end portions of the tie rods 1G extend. These end portions of the tie rods are screw threaded and provided with nuts 2l and 22 which engage the outer surfaces of the clips and hold them in embracing contact with the body portion 7.

It is obvious that the parts of the structure, when in the position as above de scribed, will hold the teeth 12 in position lUU withinv the grooves 1l. Furthermore, when it is des-fred to removeor interchange any of the teeth, it is merely necessary to remove the nuts on one side of the device to allow the tie rods to-be withdrawn from one or more of the teeth of the series, after which the teeth may be interchangedor replaced and the tie rods canl again be moved into their securing positions andA the nuts again applied thereto. By having ther channels 13v and tie rodslG positioned in planes between the collars Sand 9 working room is provided and it is .an easy matter to slide the tie rods out of securing position with the teeth. and again slide them back into. their operative clamping positions. It is further obvious that this can be donequickly and easily i without disturbing the position of the collars on the shaft.

It will benoted that in the particular embodiment of my invention as illustrated in the drawing, I have illustrated each. of the teeth provided with three holes l?, one of said holes in.. each tooth. being located. in the middle of the length, while the other twoholes are spaced. equal distances from the ends. In View of this arrangement of the holes 17i and the corresponding locations of ther channels I3, it is obvious that if a tooth becomesworn on one side, the tooth cani be reinovediandturned aroundl lengthwise and; rei'nseirted and in this manner new portions of the teeth canibe-presentedl for wear.

In order toi decreasethel necessity of frequently changing. the teeth about, they may be casel hardened, thiis alsov increasing their life to exceed that of thel chilled cast iron teeth above referred to..

Having thus described: my invention what I claim as new andfdesire to secure-by Letters Patent is: Y y

`l'. In; a: gear device, an arcuate body portion. having ar transversely extending channel; a series of teeth independent of said body portion and being arranged transversely to said channel and a tie rod positionedwithin said channel and having holding engagement with said teeth.

2: In a gear device, an arcuate body portion having a transversely extending arcuate channel; a series of teeth independent cuate channel in its outer surface; and; a tierod. fitting wit-hin said channel and adjustablyv secured to the end'- surfacesof said segmental body portion.

t. In a gear device, an. arcuate segmental body portion having longitudinally extending grooves in its outer surface; teeth removably fitting said grooves, said body portion having a transverselyy extending arcuate channel in its outer surface;rclips einbraciiig the end surfaces of said segmental .body portion; and atie rod within said channel and extending through said teeth, said tie rod having a clamping portion adapted to engage said clips. Y

In a gear device,A at shell including an arcuate segmental body portion having collars at its opposite ends spaced apart, the outer surface of said body portion being grooved longitudinally; a series of teeth removably fitting said grooves, said body portion having a transversely extending arcuate channel; and an arcuate tie rod fitting within said channel and extending through. said teeth, said tie. rod being removably secured to saidv body portion.

6. In a gear device, a body portion of arcuate segmental' cross section; a series of teeth arranged around said body portion andV being independent thereof ,i clips engaging the ends of said body portion andv havingjlianges embracing an inner surface thereof; andv a tie rod extending through said teethand' in clamping engagement with said clips.

In testimony whereof, I have vsigned my name to this specification, in the presence of two subscribing witnesses. y

FRANZ KARL SCHNEIDER'.

Witnesses 3;. LLOYD` Moena, Ran Niiwiirziiiii. 

